I have degenerative disks at L4 - L5 and have been told that I need spinal fusion to fix the problem. I have also been told by the surgeon that in a couple of years after the fusion, I will need the same surgery to repair the disks above the original surgery, because of the pressure it will put on those disks, causing their failure. I don't like the sound of that, it sounds like a dominoe effect to me and I wonder where it will stop. I have read all I can about disk replacement with flexible disks, but frankly am not finding much info that sounds promising. I am 54 years old and am a letter carrier. I walk up to 10 miles daily and am reqired to lift up to 70 pounds. I have enough leave built up to be off of work about 12 weeks. This is not work comp related so after that I am without pay. I have heard there are two level replacements being done, but I cannot find anyone that talks about that, only one level. Does anyone know of a good surgeon in the midwest, Missouri would be nice, that is competent and will do multi level replacements. I have also read that the Charite disk is not a good disk to use. Any information would be appreciated.